docs: def create_superuser(self, email, password, **extra_fields):
          """Save new User with is_staff and is_superuser set to True"""
          extra_fields.setdefault('is_staff', True)
          extra_fields.setdefault('is_superuser', True)
          if extra_fields.get('is_staff') is not True:
              raise ValueError('Superuser must have is_staff=True.')
          if extra_fields.get('is_superuser') is not True:
              raise ValueError('Superuser must have is_superuser=True.')
          return self._create_user(email, password, **extra_fields)